CERN PS Division

CERN PS Division
Name	CERN PS Division
Formation	1959
Headquarters	Meyrin, Geneva
Parent organisation	CERN

CERN PS Division

The CERN PS Division is the operational and technical unit responsible for the Proton Synchrotron complex at CERN near Geneva. It operates and maintains the historic Proton Synchrotron accelerator, coordinates injector chains feeding the Super Proton Synchrotron and the Large Hadron Collider, and supports a range of fixed-target and test-beam experiments including collaborations with ISOLDE and nTOF. The Division integrates specialists from accelerator physics, RF engineering, vacuum technology, cryogenics, and radiation protection to sustain continuous beam delivery for international particle-physics programmes.

History

The genesis of the Division traces to the construction and commissioning of the Proton Synchrotron in the late 1950s, an era that also saw the foundation of CERN and contemporaneous projects like the Synchrocyclotron and the European Organization for Nuclear Research infrastructure expansion. Over successive decades the group supported milestone experiments such as those conducted by collaborations associated with the Omega spectrometer and the early fixed-target programmes that laid groundwork for discoveries later pursued at the Super Proton Synchrotron and the Large Electron–Positron Collider. During the 1970s and 1980s the Division adapted to the demands of injector chains serving machines like the ISR and later the LEP project, evolving organizationally alongside programmes like ISOLDE and experiments at the CERN Neutrinos to Gran Sasso precursor studies. More recently, the Division played a central role in providing high-intensity beams for the Large Hadron Collider era and supported development collaborations leading to projects such as the High-Luminosity LHC injector upgrades.

Organization and Structure

The Division is embedded within CERN’s Accelerator and Technology sector and comprises distinct groups responsible for accelerator physics, beam instrumentation, RF systems, power converters, magnet maintenance, vacuum systems, and controls engineering. Management interfaces with directorates overseeing the Super Proton Synchrotron operations, injector chain coordination, and programme liaison with experiments like ISOLDE, nTOF, NA61/SHINE, and test beam facilities. Technical staff include experts seconded from national laboratories such as DESY, Fermilab, and INFN institutes, and collaborate with university groups from institutions including University of Oxford, ETH Zurich, and Université de Genève. The Division operates within CERN’s safety, finance, and human-resources frameworks and contributes to cross-divisional programmes with groups like the CERN Engineering Department and the Technology Department.

Accelerator Complex and Facilities

Central to the Division is the historic Proton Synchrotron ring, a primary injector that delivers beams to the Super Proton Synchrotron, the Antiproton Decelerator, and indirectly to the Large Hadron Collider. The injector chain includes the Linac2 and Linac4 systems, the Proton Synchrotron Booster, and transfer lines such as the TT2 and TT10 complexes which route beams to experimental areas including North Area, East Area, and secondary-target stations feeding ISOLDE. The Division maintains magnet families, septa, kicker systems, and complex vacuum sectors, alongside beam diagnostics like beam position monitors and current transformers developed with partners including CERN BE-OP and CERN RF. Dedicated experimental and test facilities include fixed-target halls used by collaborations such as NA61/SHINE, detector test-beam campaigns involving institutes like CERN EP, and irradiation services for detector R&D shared with EST groups.

Research and Operations

Operational responsibilities cover beam scheduling, cycle optimisation, intensity ramp-up, machine studies, and fault-recovery procedures; these activities intersect with research in accelerator physics topics such as space-charge compensation, beam dynamics, collective effects, and RF gymnastics. The Division supports user experiments in hadron spectroscopy, neutrino targetry, and radioactive-beam production through collaborative programmes with ISOLDE, nTOF, and external consortia including ESS and national research councils. R&D efforts span high-gradient RF systems, low-level RF control, advanced beam instrumentation, and novel extraction techniques worked on with partners like CERN TE-ABT and academic groups from CERN School of Accelerators. Operational data feed into simulation tools developed jointly with teams at CERN IT and external software projects such as MAD-X and FLUKA.

Upgrades and Projects

The Division leads and contributes to upgrade projects addressing injector performance for the High-Luminosity LHC and future facilities. Key initiatives include consolidation of RF power systems, replacement programmes connected to Linac4 commissioning, high-intensity injection optics improvements, and implementation of mitigation measures for beam-loss reduction inspired by studies from PS Booster upgrade and the LIU (LHC Injectors Upgrade) project. Collaborative upgrade efforts involve engineering partners from STFC, CEA Saclay, GSI Helmholtz Centre, and industrial suppliers across Europe, integrating technologies such as solid-state RF amplifiers, active feedback systems, and radiation-hard diagnostics. Long-term studies explore compatibility with proposed projects like Future Circular Collider injectors and novel concepts tested in conjunction with CERN openlab and university accelerator centres.

Safety, Environmental and Technical Services

Safety and environmental stewardship form integral responsibilities: radiation protection programmes align with CERN Radiation Protection standards, while waste management, water cooling, and cryogenics interfaces coordinate with utilities at the Meyrin site and Prévessin site. The Division’s technical services include maintenance workshops, magnet and coil fabrication, vacuum bake-out facilities, and specialised cryogenic support collaborating with groups such as CERN Cryolab and the CERN Safety Commission. Emergency procedures, occupational safety training, and compliance activities are conducted with CERN Occupational Health and regional authorities in Geneva and Vaud. Continuous monitoring of environmental emissions and beam-loss patterns informs mitigation plans developed in concert with the CERN Environment and Sustainability initiatives.

Category:CERN